print(1,2,3)
print()#空的元组

print(42)#字符
print(42,)#元组
print(3 * (42 + 2))#逗号的区别
print(3 * (42 + 2,))

print(tuple([1,2,3]))#列表和元组的转变
print(tuple(‘abc‘))
print(tuple((1,2,3)))